Year	% (national estimate)
1966	45.47
1972	33.4
1976	41.76
1986	38.85
1991	37.27
1996	30.73
2005	34.636
2006	33.036
2007	31.4
2008	29.048
2009	29.517
2010	29.18
2011	27.047
2012	27.873
2013	25.884
2014	24.568
2015	24.991
2016	26.481
2017	27.702
2018	27.19
2019	26.155
2020	22.542
2021	22.058
2022	22.643